Slide-valve



J. RODGBRS.

SLIDE VALVE.

(No Model.)

No. 561,031. Patented May 26, 1896.

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c. n n m m n s A W o m w o n .P M A UNITED STATES PATENT EETCE".

JAMES RODGERS, OF ALLEGHENY, PENNSYLVANIA.

SLIDE-VALVE.

SPECIFICATION forming part of Letters Patent No. 561,031, dated May 26, 1896. Application led September 7, 1895. Serial No. 561,779. (No model.)

To a/ZZ whom, t may concern:

Be it known that I, JAMES RoDGERs, a citizen of the United States, residing at Allegheny, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements. in Slide-Valves; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanyyside View of the plate.

ing drawings, and to the figures of reference marked thereon, which form a part of this specification.

This invention relates to certain new and useful improvements in slide-valves for steam-engines, and has for its object the provision of novel means whereby the steampressure on the back of the valve may be reduced.

The invention has for its further object to produce an equal pressure of steam on both ends of the slide-valve, thereby acquiring a uniformity of pressure and 4gaining advantages that Will be apparent.

A still further object of the invention is to construct a valve of the above-referred-to class that willgbe strong, durable, comparatively inexpensive to manufacture, and accurate in its operation.v

With the above and other objects in View the invention finally consists in the novel construction, combination, and arrangement of parts, to be hereinafter more particularly described, and specifically pointed out in the claim.

In describing the invention in detail reference is had to the accompanying drawings, forming a part of this specification, and wherein like -figures of reference indicate similar parts throughout the several views, in which- Figure 1 is a top plan view of my improved slide-valve. Fig. 2 is a horizontal sectional view on the line X X of Fig. 1. Fig. 3 is a Fig. 4 is a plan view of the same. Fig. 5 is a longitudinal section taken through Fig. 1.

In the drawings, 1 represents the steam cylinder or chest, which is provided on one side with a wall 2, said wall being provided at the lower corners with apertures 3 3 to allow the steam from the entrance-port 4 to pass into the cylinder or chest.

The valve-rod 5 is provided with a slidevalve 6, located in the steam-chest 1, said slide-valve 6 being secured to the rod by means of nuts 7 7 7 7 or in any other suitable manner. The steam-chest 1 is further provided on its underneath side with apertures 8 S 8, and on the base-plate of the same are secured pins 9 9 9 9 for the retention of the springs 10 lO 10 10. The cover or top 11 of the steam-chest 1 is provided with a baflieplate 12 on its underneath side, having secured thereto at its center a tube or steamport 13, and provided near its ends with pins 14E 14 1-1 14., adapted to engage the springs 10 10 10 10, secured on the pins 9 9 9 9 on the base-plate of the chest 1. The cover or top 11 of the steam-chest is further provided with set-screws 15 15 15 15, which are fitted in screw-threaded apertures and adapted to be screwed downward or upward to adjust the baffle-plate 12. Y

Operation: The advantages of the abovedescribed valve to reduce the pressure of steam on the back of the valve will be readily apparent, the back of the valve being faced and the baiiie-plate faced to the back .of the slide-valve, as well as the slide-valve being faced to the steam-chest, so that when receiving steam from the boilers it only acts on both ends of the slide-valve and thereby making an equal pressure on both ends of the slide-valve. The slide-valve is preferably constructed with round edges, so that the same will not strike the edges of the steam-ports and thereby causing the bending of the valve-stem, as is often the case. The baffle-plate is made to fit as snugly as possible on the top of the slide-valve, so as to prevent the steam from escaping above the bafe-plate. It will be observed that the springs may be of any strength desired in order to conform with the boiler-pressure and serve to keep the baiiie-plate from tightening on the top of the slide-valve. The tube or steamport 13, attached to the baffle-plate, will indicate the presence of any steam between the top of the slide-valve and the baffle-plate, and when this occurs the set-screws arranged in the top or cover of the steam-chest are adj usted so as to force the baffle-plate down- IOO Ward and snugly against the back of the slidevalve, at the same time still allowing the slidevalve to move freely and easily. If the set-screws are adjusted properly, there will he no show of steam through the tube 13, and the valve will Work smoothly and freely.

It will be noted that by the use of the above-described valve the pressure on the back of the valve will be reduced considerably, and that an engine will be more easily reversed than would be the case Without my improved valve, and that it will for these reasons save considerable Wear and tear on the engines.

It will be notefl,fiiithe1,tl1at various changes maybe made in the details of construction of my improved val ve Without departing from the general spirit of my invention.

Having fully described my invention, what JAMES RODGERS. lVtnesses:

RALPH DAU, II. J. Lnvls. 

